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Re: [PATCH V6 1/2] libxl: Add support for Virtio disk configuration
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Oleksandr <olekstysh@xxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 6 Jan 2022 09:06:55 +0100
- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>
- Delivery-date: Thu, 06 Jan 2022 08:07:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.12.21 17:46, Anthony PERARD wrote:
On Fri, Dec 17, 2021 at 06:50:02PM +0200, Oleksandr wrote:
On 17.12.21 17:26, Juergen Gross wrote:
On 15.12.21 22:36, Oleksandr wrote:
On 15.12.21 17:58, Juergen Gross wrote:
In practice we are having something like the "protocol" already today:
the disk device name is encoding that ("xvd*" is a Xen PV disk, while
"sd*" is an emulated SCSI disk, which happens to be presented to the
guest as "xvd*", too). And this is an additional information not
related to the backendtype.
You mean in theory? ;-) In practice, xvd* is the same as hd* (or sd*?).
I tried once to have xvd* mean PV disk only, but the patch was rejected.
So at the moment, we always get an emulated disk, we can't have PV disk
alone, at least on x86.
What?
Of course we can. Take any PV or PVH guest excluding dom0, and you'll
see that.
Juergen
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